On which to write home? (3)
I believe the answer is:
pad
'home?' is the definition.
(pad can mean a person's home)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for pad that I've seen before include "Bachelor's place?" , "Residence" , "Colloquial apartment or soft bundle" , "Batsman's protection" , "Stuff the animal's foot" .)